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標題: New versatile ligand family, pyrazine-modulated oligo-alpha-pyridylamino ligands, from coordination polymer to extended metal atom chains
作者: Ismayilov, R.H.
Wang, W.Z.
Lee, G.H.
Wang, R.R.
Liu, I.P.C.
Yeh, C.Y.
Peng, S.M.
關鍵字: linear trichromium complexes;di(2-pyridyl)amide dpa ligands;string;complexes;structural versatility;magnetic-properties;molecular wires;tripyridyldiamido dianion;bonding interaction;crystal-structures;cr;contacts
Project: Dalton Transactions
期刊/報告no:: Dalton Transactions, Issue 27, Page(s) 2898-2907.
Here we designed and synthesized a new ligand, di(2-pyrazyl)amine (Hdpza) (1) and studied its coordination modes and the corresponding complexes with Cu(II), Co(II), Ni(II) and Cr(II). Hdpza is an analogue of the well-studied di(2-pyridyl)amine (Hdpa) ligand, which was used to generate the first extended metal atom chain. Three types of coordination modes were found: anti-anti style which resulted in a mononuclear compound [Cu(Hdpza)(2)(H(2)O)(2)](ClO(4))(2) (2); anti-syn which was observed in a complex for the first time and resulted in a 2-D coordination polymer [Co(mu(2)-Hdpza)(2)(NCS)(2)] (3); and syn-syn type which was observed in extended metal atom chains [Ni(3)(mu(3)-dpza)(4)Cl(2)] (4), [Ni(3)(mu 3-dpza)(4)(NCS)(2)] (5) and [Cr(3)(mu(3)-dpza)(4)Cl(2)] (6). Weak antiferromagnetic coupling via Hdpza was observed in 3, whereas magnetic studies on extended metal atom chains 4 and 5 revealed that the interaction parameter was more than -200 cm(-1). Electrochemistry showed that the extended metal atom chains 4-6 are much more stable to oxidation than the Hdpa complexes, and are able to undergo reduction.
ISSN: 1477-9226
DOI: 10.1039/b700533d
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